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• How can I transcode a file with FFMPEG and stream the output file in the response of a Java servlet ?

  6 octobre 2012, par user1700589

  Basically, this is what I'm trying to do :
  1. User passes a URL as a GET parameter to my servlet.
  2. Servlet uses a ProcessBuilder to convert the media contained in that URL to a valid media format (ie : MP3).
  3. The servlet streams the output file being transcoded by FFMPEG back to the browser.

  1 and 2 work fine, but it is 3 I am having a problem with. The best I can do is create a FileInputStream to the output file being transcoded and send that as the response but it is not working. My guess is that it is because the file is being written as I'm trying to stream it.

  Is there anyway to intercept the output file argument in FFMPEG and read it into an InputStream ? In my mind it does not seem that it should be difficult to take input file A, transcode it to output file B, and then stream output file B back to the client, on the fly.

  ProcessBuilder pb = new ProcessBuilder("ffmpeg.exe", "-i", url, "file.mp3");
  
      Process p = pb.start();
  
  
  
      final InputStream inStream = p.getErrorStream();
  
  
  
      new Thread(new Runnable() {
  
  
  
      public void run() {
  
              InputStreamReader reader = new InputStreamReader(inStream);
  
              Scanner scan = new Scanner(reader);
  
              while (scan.hasNextLine()) {
  
                  System.out.println(scan.nextLine());
  
              }
  
          }
  
      }).start();
  
  
  
      ServletOutputStream stream = null;
  
      BufferedInputStream buf = null;
  
      try {
  
  
  
          stream = response.getOutputStream();
  
          File mp3 = new File(file.mp3");
  
  
  
          //set response headers
  
          response.setContentType("audio/mpeg");
  
  
  
          response.addHeader("Content-Disposition", "attachment; filename=file.mp3");
  
  
  
          response.setContentLength(-1);
  
  
  
          //response.setContentLength((int) mp3.length());
  
  
  
          FileInputStream input = new FileInputStream(mp3);
  
          buf = new BufferedInputStream(input);
  
          int readBytes = 0;
  
          //read from the file; write to the ServletOutputStream
  
          while ((readBytes = buf.read()) != -1) {
  
              stream.write(readBytes);
  
          }
  
      } catch (IOException ioe) {
  
          throw new ServletException(ioe.getMessage());
  
      } finally {
  
          if (stream != null) {
  
              stream.close();
  
          }
  
          if (buf != null) {
  
              buf.close();
  
          }
  
      }

• FFMPEG with PHP does not execute ?

  15 septembre 2012, par Conor

  After reading about a gazillion questions here on SO related to FFMPEG with PHP I have gotten together a small snippet or what-not, but it does not seem to do anything - not even throw errors.

  My PHP is as follows :

  function get_video_thumbnail($file) {
  
      define('ALL_PLACE_WIDTH', 250);
  
      define('ALL_PLACE_HEIGHT', 200);
  
  
  
      $ffmpeg = "ffmpeg"; // where ffmpeg is
  
      $image_source_path = $file; // where the video is
  
      $image_cmd = " -r 1 -ss 00:00:10 -t 00:00:01 -s ".ALL_PLACE_WIDTH."x".ALL_PLACE_HEIGHT."   -f image2 "; // command
  
      $dest_image_path = "cdn/thumbnails"; // destination of thumbnail
  
  
  
      $str_command = $ffmpeg  ." -i " . $image_source_path . $image_cmd .$dest_image_path;     
  
      shell_exec($str_command);
  
  }

  in the root folder there's a folder "ffmpeg" in what there's "ffmpeg.exe", "ffplay.exe" and "pthreadGC2.dll". So I'm wondering, is there anything I'm missing ? I'm trying to generate a thumbnail from a video/mp4 file.

• Creating video from image using FFMPEG

  27 août 2012, par yashprit

  I am creating video editing application using JavaScript, ffmpeg and java. Using FFMPEG i have created extract n frame of video, than using canvas.toDataUrl I am replacing new image with existing image frame rate and everything has taken care, but when I use these image to create video, FFMPEG never include newly created PNG image.

  code to save png image from HTML5 canvas

  Base64 decoder = new Base64();
  
      byte[] pic = decoder.decodeBase64(request.getParameter("pic"));
  
      String frameCount = request.getParameter("frame");
  
      InputStream in = new ByteArrayInputStream(pic);
  
      BufferedImage bImageFromConvert = ImageIO.read(in);
  
      String outdir = "output\\"+frameCount;
  
      //Random rand = new Random();
  
      File file = new File(outdir);
  
      if(file.isFile()){
  
          if(file.delete()){
  
              File writefile = new File(outdir);
  
              ImageIO.write(bImageFromConvert, "png", file);
  
          }
  
      }

  Code for creating image from video

  String filePath = "D:\\temp\\some.mpg";
  
      String outdir = "output";
  
      File file = new File(outdir);
  
      file.mkdirs();
  
      Map m = System.getenv();
  
  
  
      /*
  
       * String command[] =
  
       * {"D:\\ffmpeg-win32-static\\bin\\ffmpeg","-i",filePath
  
       * ,"-r 30","-f","image2",outdir,"\\user%03d.jpg"};
  
       * 
  
       * ProcessBuilder pb = new ProcessBuilder(command); pb.start();
  
       */
  
      String commands = "D:\\ffmpeg-win32-static\\bin\\ffmpeg -i " + filePath
  
              + " -r 30  -f image2 " + outdir + "\\image%05d.png";
  
      Process p = Runtime.getRuntime().exec(commands);

  code for creating video from image

  String filePath = "output";
  
      File fileP = new File(filePath);
  
      String commands = "D:\\ffmpeg-win32-static\\bin\\ffmpeg -f image2 -i "
  
              + fileP + "\\image%5d.png " + fileP + "\\video.mp4";
  
      System.out.println(commands);
  
      Runtime.getRuntime().exec(commands);
  
      System.out.println(fileP.getAbsolutePath());